☣️ UN 1045 • CLASS 2

UN 1045 — Fluorine, compressed

Placard: Toxic Gas. ERG Guide 124. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.

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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.

Fluorine is a highly toxic and corrosive gas that can be fatal if inhaled or absorbed through the skin. It is a pale yellow to greenish-yellow gas with a pungent, irritating odor and is extremely corrosive and reactive.

Hazard overview: Fluorine is highly toxic and may cause severe burns or respiratory damage if inhaled. Fire will produce irritating, corrosive and/or toxic gases, making it a highly hazardous substance.

Response guidance: In the event of a fluorine leak, evacuate the area immediately and isolate the source. Do not use water or foam to extinguish surrounding fires, instead use dry chemical or sand to prevent the spread of the fire.

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UN 1045 Quick Details

UN 1045
Product name: Fluorine, compressed
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 124 (check current ERG)
Initial isolation: ERG 124: isolate 800m all directions initially; evacuate 1600m downwind if leak; 2000m if fire

Common Hazards of UN 1045

  • TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin.
  • Fire will produce irritating, corrosive and/or toxic gases.
  • Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
  • Runoff from fire control or dilution water may cause environmental contamination.
  • Substance does not burn but will support combustion.
  • Vapors from liquefied gas are initially heavier than air and spread along ground.
  • These are strong oxidizers and will react vigorously or explosively with many materials including fuels.
  • May ignite combustibles (wood, paper, oil, clothing, etc.).

Chemical Identity & Physical Properties

Fluorine is a pale yellow to greenish-yellow gas with a pungent, irritating odor and is extremely corrosive and reactive.

Also known asFluorine gasDifluorineMolecular fluorineF2
CAS Number7782-41-4
AppearancePale yellow to greenish-yellow gas with a pungent, irritating odor. Extremely corrosive and reactive oxidizer.
Flash PointNot applicable (non-flammable but supports combustion)
Boiling Point-188C (-306F)
Vapor Density1.3 (heavier than air)
Water ReactivityReacts violently with water producing toxic and corrosive hydrofluoric acid and oxygen
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1045

Extinguishing Media

Do not use water or foam; dry chemical or sand only for surrounding fires

PPE Requirements

⚠️ Level A required; SCBA with full face piece; fluorine-resistant materials; no exposed skin

Level A protective equipment is required, including a self-contained breathing apparatus and fluorine-resistant materials to prevent skin exposure.

Isolation & Evacuation

ERG 124: isolate 800m all directions initially; evacuate 1600m downwind if leak; 2000m if fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 124).

First Actions for a UN 1045 Incident

  • Keep unauthorized personnel away.
  • Stay upwind, uphill and/or upstream.
  • Ventilate closed spaces before entering, but only if properly trained and equipped.
  • Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
  • See Table 1 - Initial Isolation and Protective Action Distances.
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📋 Copy & Share Field Card

UN 1045 — Fluorine, compressed
HAZMAT RADIO NOTE — UN 1045 Product: Fluorine, compressed Class 2 / Toxic Gas / ERG 124 PPE: Level A required; SCBA with full face piece; fluorine-resistant materials; no exposed skin ISOLATION: ERG 124: isolate 800m all directions initially; evacuate 1600m downwind if leak; 2000m if fire ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO

Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.

SMS WhatsApp
=== IC HAZMAT BRIEFING === UN 1045 — Fluorine, compressed Class: 2 | Placard: Toxic Gas | ERG Guide: 124 Appearance: Pale yellow to greenish-yellow gas with a pungent, irritating odor. Extremely corrosive and reactive oxidizer. Water Reactivity: Reacts violently with water producing toxic and corrosive hydrofluoric acid and oxygen Extinguishing: Do not use water or foam; dry chemical or sand only for surrounding fires PPE: Level A required; SCBA with full face piece; fluorine-resistant materials; no exposed skin Isolation: ERG 124: isolate 800m all directions initially; evacuate 1600m downwind if leak; 2000m if fire — Key Hazards — • TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin. • Fire will produce irritating, corrosive and/or toxic gases. • Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. — First Actions — • Keep unauthorized personnel away. • Stay upwind, uphill and/or upstream. • Ventilate closed spaces before entering, but only if properly trained and equipped. • Isolate spill or leak area for at least 100 meters (330 feet) in all directions. SOURCE: allfirefighter.com/hazmat/un/1045 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)
UN1045 Fluorine, compressed Cls2 ERG124 | ERG 124: isolate 800m all directions initially; evacuate 1600m downwind if leak; | allfirefighter.com/hazmat/un/1045SMS / 160 CHAR

Use for: Quick text to command or incoming units. Fits in a single SMS.

⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/fluorine-compressed-un-1045

Related UN Numbers in Class 2

Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 1045

No, fluorine is not flammable, but it can ignite other materials.

Fluorine reacts violently with water, producing toxic and corrosive hydrofluoric acid and oxygen.

Level A protective equipment, including a self-contained breathing apparatus and fluorine-resistant materials, is required to handle fluorine safely.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.